Maxmoefoe hidden options:

Mono-Rock:
Shuckle/Armaldo/Crustle/Probopass/Tyrantitar-M/Stakataka/Bastiodon/Aggron

Mono-water: (SCARY)
Sharpedo/Crawdaunt/Greninja/Empoleon/Araquanid/Golisopod

Mono-Grass:
Cacturne/Shiftry/Wormadam/Leavanny/Parasect/Kartana/Ferrothorn

Mono-Fighting:
Lucario/Cobalion/Pangoro/Scrafty/Heracross-M/Buzzwole

Mono-Poison:
Skuntank/Muk-A/Drapion/Scolipede/Beedril-M/Dustox/Venomoth/Ariados

Mono-Flying:
All bug-flying/Honchcrow/Mandibuzz/Bisharp

note: while fire may seem good, he can hit back with mono-rock or mono-water